Smoke Pocketfolds and white cardstock. I used a stamp for the S and embossed with my heat tool.

If I had to do over, I would go for a simpler invite. These ended up costing $3-4 plus $1.08 in postage. We hand delivered a lot, to save on postage. Because of the size and shape, they could not fit in the machine at the post office = hand cancelling without the hassle.